4x5 Rollei infrared film

[MultiFormat Shooter]

I have been wanting to try infrared film in 4x5. It looks like the Rollei film is the only thing currently available. Will this film give a pronounced Wood effect with the B+W 092 filter? I was thinking this filter might give slightly more speed than a Hoya R72 filter.

I tried searching the forums, but didn't find much on 4x5 infrared.

 

[Andrew O'Neill]

I only have experience with the 72, and it does a pretty good job. There's only one way to find out!

 

[MultiFormat Shooter]

I only have experience with the 72, and it does a pretty good job.

Do you have any recommendations, for a "starting" EI for the R72 filter and this film?

 

[Andrew O'Neill]

Yes! I normally rate this film at EI200. I add 5 stops for the filter. EI 6. I also generated reciprocity data which I'd be happy to share with you. Let he know! I'm in Japan and hoping to shoot this film in my TravelWide. Have the data on my phone!

 

[MultiFormat Shooter]

Yes! I normally rate this film at EI200. I add 5 stops for the filter. EI 6. I also generated reciprocity data which I'd be happy to share with you.

Thanks for the EI information! If you have reciprocity data, that would be awesome! Thanks!

 

[Neil Grant]

Yes! I normally rate this film at EI200. I add 5 stops for the filter. EI 6. I also generated reciprocity data which I'd be happy to share with you. Let he know! I'm in Japan and hoping to shoot this film in my TravelWide. Have the data on my phone!

...or just call it a 6 ASA film with an R 72 filter (probably under blazing sunlight). For convenience I'd call it 4 ASA, then your 'sunny exposures' are 1/4 at f/16. That's a lot easier to 'set' than 1/6th. Filter factors involving narrow pass bands and narrow film sensitivities don't make much sense.

 

[Andrew O'Neill]

EI 6 has worked very well for me with this filter for several years. I normally rate this film at 200 without filter so it gets more than ample exposure.

 

[Andrew O'Neill]

@multiformayltshooter, I'm having difficulty uploading onto my phone the reciprocity data from Japan...big file and eats too much data. I'll upload when I return to Canada in a couple weeks.

 

[MultiFormat Shooter]

@multiformatshooter, I'm having difficulty uploading onto my phone the reciprocity data from Japan...big file and eats too much data. I'll upload when I return to Canada in a couple weeks.

No worries! Thanks, I appreciate it!

 

[dE fENDER]

As alternative you may try to search a tricarbocyanine/ tetracarbocyanine dye in chemistry suppliers (for example, xenocyanine / cas 19764-90-0 ) . It would cost a lot (~300 $/g), but you will be able to sensitize any 4x5 bw film, or even 8x10. Xenocyanine with its 960 nm peak will make possible to use 093 filter.

 

[MultiFormat Shooter]

As a corollary, how does one compensate for the focus difference between visible and IR light with large format? There's no "little IR mark" on the lens, obviously.

 

[dE fENDER]

As a corollary, how does one compensate for the focus difference between visible and IR light with large format? There's no "little IR mark" on the lens, obviously.

Closed iris + some correction by expirience. IR mark will not get you 100% sharpness too.